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you need to print clean page two or three times to clean printer path for toner , then check the last page you if there other black market , tell me , what black market looks like , hope that helped you
are you printing from Doc feeder or glas?? if from feeder then try to make a copy from the glass, does it still do it? yes problem is with drum. No? problem is with the small scanning glass to the left, look carefully see if any spots or lines on the 1inch glas --- clean it
Your problem lies with the fact that you manually refilled your cartridges. This is not recommended by any technician I know and your solution is in the replacement of all your cartridges with genuine brother consumables. It is going to be expencive, but it is the only real solution.
You most likely have a bad black developer housing. You can try removing the waste bottle and using that bla\ck stick inside the cover to clean the laser ****.
But it sounds like the developer housing has failed.
i experienced a tainted vertical black lines on the boths sides of my lcd screen. There was no scratch or whatsoever that could be the reason why thsi balck colored vertical lines to spread. Hope you can help me solve this problem. Thank you..
Most likely cause is that a roller has degraded during storeage. Measure the distance from the centre of the first band to the second and from the center of the second band to the third. If this dimesion is fairly constant you can work out exactly which roller is causing the problem.
The most likely culprit will be the Photo Conductor Unit. This will give a large dimension - (approx the 29cm??)
A service manual should give you the dimensions (circumferences) of the rollers within the machine. If you have a spare pcu around, put it in and see if it makes ANY difference.